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When there was an eleventh-hour “moderator crisis” after the screening of the new film “Mudbound” on Sunday, former “Good Day New York” host Greg Kelly jumped into action as interviewer.

Spies said that during the screening, Kelly — technically on his honeymoon after marrying Judith Grey — received a text from organizers while in the audience asking if he’d fill in as moderator.

The former Marine accepted the mission, watched the movie carefully and adeptly led a Q&A at the Rainbow Room with director Dee Rees, Mary J. Blige, Carey Mulligan and others afterward.

The film follows African-American World War II vets facing racism when they return home.

Revealed Blige — who’s been in a bitter court battle with her ex, Martin Isaacs — of the project, “I had to take everything I was dealing with personally . . . My personal life was in shambles, still is. But this is great. The good is happening.”